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Title: Structural transition of partially Ba-filled thermoelectric CoSb{sub 3} investigated by positron annihilation spectroscopy

Abstract

Microstructure of unfilled and Ba-filled CoSb{sub 3} has been studied by positron lifetime measurements together with theoretical calculation. Positron trapping in intrinsic voids is observed in the CoSb{sub 3}, which contributes a positron lifetime of 263 ± 2 ps. After filling Ba atoms with content up to x = 0.4, the positron lifetime shows continuous increase. By comparing the experimental results with calculation following the phase diagram of Ba{sub x}Co{sub 4}Sb{sub 12} with x in the range of 0–0.5, it is found that when the Ba content is lower than 0.16, the filling of Ba atoms is in a phase of solid solution. At x = 0.2, γ phase is formed, which is mixed with solid solution. At x > 0.25, transition from γ phase to a mixture of γ and α phases is confirmed.

Authors:
; ;  [1];
  1. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044 (China)
Publication Date:
OSTI Identifier:
22413063
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNIHILATION; ANTIMONIDES; ATOMS; BARIUM COMPOUNDS; COBALT COMPOUNDS; COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; GAMMA SPECTROSCOPY; LIFETIME; MICROSTRUCTURE; PHASE DIAGRAMS; POSITRONS; SOLID SOLUTIONS; TRAPPING

Citation Formats

Zhang, T., Li, X. F., Chen, Z. Q., E-mail: chenzq@whu.edu.cn, Zhou, K., Su, X. L., and Tang, X. F., E-mail: tangxf@whut.edu.cn. Structural transition of partially Ba-filled thermoelectric CoSb{sub 3} investigated by positron annihilation spectroscopy. United States: N. p., 2015. Web. doi:10.1063/1.4906968.
Zhang, T., Li, X. F., Chen, Z. Q., E-mail: chenzq@whu.edu.cn, Zhou, K., Su, X. L., & Tang, X. F., E-mail: tangxf@whut.edu.cn. Structural transition of partially Ba-filled thermoelectric CoSb{sub 3} investigated by positron annihilation spectroscopy. United States. https://doi.org/10.1063/1.4906968
Zhang, T., Li, X. F., Chen, Z. Q., E-mail: chenzq@whu.edu.cn, Zhou, K., Su, X. L., and Tang, X. F., E-mail: tangxf@whut.edu.cn. 2015. "Structural transition of partially Ba-filled thermoelectric CoSb{sub 3} investigated by positron annihilation spectroscopy". United States. https://doi.org/10.1063/1.4906968.
@article{osti_22413063,
title = {Structural transition of partially Ba-filled thermoelectric CoSb{sub 3} investigated by positron annihilation spectroscopy},
author = {Zhang, T. and Li, X. F. and Chen, Z. Q., E-mail: chenzq@whu.edu.cn and Zhou, K. and Su, X. L. and Tang, X. F., E-mail: tangxf@whut.edu.cn},
abstractNote = {Microstructure of unfilled and Ba-filled CoSb{sub 3} has been studied by positron lifetime measurements together with theoretical calculation. Positron trapping in intrinsic voids is observed in the CoSb{sub 3}, which contributes a positron lifetime of 263 ± 2 ps. After filling Ba atoms with content up to x = 0.4, the positron lifetime shows continuous increase. By comparing the experimental results with calculation following the phase diagram of Ba{sub x}Co{sub 4}Sb{sub 12} with x in the range of 0–0.5, it is found that when the Ba content is lower than 0.16, the filling of Ba atoms is in a phase of solid solution. At x = 0.2, γ phase is formed, which is mixed with solid solution. At x > 0.25, transition from γ phase to a mixture of γ and α phases is confirmed.},
doi = {10.1063/1.4906968},
url = {https://www.osti.gov/biblio/22413063}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 5,
volume = 117,
place = {United States},
year = {Sat Feb 07 00:00:00 EST 2015},
month = {Sat Feb 07 00:00:00 EST 2015}
}